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(i) When a beam of light is passed through a colloidal sol. (iii) Cl-(CH 2) 4-Cl into hexan-1, 6-diamine? (i) Mole fraction (ii) Molality (iii) Molarity (iv) Mass percentage. Why is it necessary to remove CO when ammonia is obtained by Haber's process?Īlthough phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol. (iii) The highest oxidation state is exhibited in oxoanions of a metal. (ii)A transition metal exhibits highest oxidation state in oxides and fluorides. (i)The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
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Give examples and suggest reasons for the following features of the transition metal chemistry: What is demulsification? Name two demulsifiers.Įxplain how rusting of iron is envisaged as setting up of an electrochemical cell.ĭiscuss briefly giving an example in each case the role of coordination compounds in: The molar depression constant for benzene is 5.1 Kkg mol -1. When dissolved in 20 g of benzene (C 6H 6), 1 g of AB 2 lowers the freezing point by 2.3 Kwhereas 1.0 g of AB 4 lowers it by 1.3 K. Two elements A and B form compounds having formula AB 2 and AB 4.
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Recently Viewed Questions of Class 12 Chemistry If the solubility of H 2S in water at STP is 0.195 m, calculate Henry's law constant. H 2S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If NaCl is doped with 10 -3mol % of SrCl 2, what is the concentration of cation vacancies? Also find the composition of the vapour phase.Ĭalculate the mass of a non-volatile solute (molar mass 40 g mol -1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.Ĭalculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Calculate the quantity of CO 2in 500 mL of soda water when packed under 2.5 atm CO 2 pressure at 298 K. Henry's law constant for CO 2 in water is 1.67 x 10 8Pa at 298 K. (xix) tert-Butyl bromide to isobutyl bromideĪ solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is 1.2 g mL -1, then what shall be the molarity of the solution? (x) 2-Methyl-1-propene to 2-chloro-2-methylpropane (ix) 2-Chlorobutane to 3, 4-dimethylhexane (vi) Benzyl alcohol to 2-phenylethanoic acid How the following conversions can be carried out? Calculate the freezing point of 5% glucose in water if freezing point of pure water is 273.15 K. Give simple chemical tests to distinguish between the following pairs of compounds.Ī 5% solution (by mass) of cane sugar in water has freezing point of 271 K. This increase in the atomic size is attributed to an increase in the number of shells. (iv) Atomic size: On moving down a group, the atomic size increases. As we move down a group, electronegativity decreases, owing to an increase in size. This is because of increasing atomic sizes. (iii) Ionization energy and electronegativity:įirst ionization decreases on moving down a group. This happens because of the inert pair effect. However, the stability of +5 oxidation state decreases down a group, whereas the stability of +3 oxidation state increases. In addition to the -3 state, N and P also show -1 and -2 oxidation states.Īll the elements present in this group show +3 and +5 oxidation states. The remaining elements of this group show a formal oxidation state of -3 in their covalent compounds.
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This can take place only with nitrogen as it is the smallest in size and the distance between the nucleus and the valence shell is relatively small. However, gaining electrons is very difficult as the nucleus will have to attract three more electrons. (ii) Oxidation states: All these elements have 5 valence electrons and require three more electrons to complete their octets. Their general electronic configuration is ns2 np3. (i) Electronic configuration: All the elements in group 15 have 5 valence electrons.